It gives you no way to adjust which part of the cone you want to mic, and even distance can have an effect on the sound. To me, once you do something like this, you may as well be using a cabinet simulator - which I'm not opposed to - but if you're going to go that round, why drag out a cabinet with a special mic?

Back in the "day" we tried "micing" an amp and found we had to place the mic just "so far" from the amp to avoid feedback. How was that problem solved in this case( "building" the mic into the speaker grill, so to speak)?

I believe they've put a great deal of research into building the mic pointed in the perfect "off-axis" spot... at least as much as all the guys who have duct tape on their speaker grills so they know where to place the mic.

This thing was designed in consultation with people like engineer/producer Gil Norton (Foo Fighters/Pixies) and guitarist Robbie McIntosh (Paul McCartney/The Pretenders/John Mayer)...

I carry a couple of Sennheiser e609's that I prefer to drape over my amps (slightly off center of the speaker) since I use tilt-back floor stands and most of my amps have top-mounted controls. I still deal with soundguys who insist on using stands, even if they're using e609s, which makes it a pain for me to adjust my amps.

But I will probably eventually get a couple of these... plug and play, consistent... makes sense to me.

The proof is in the pudding...if it sounds fantastic, that would be good enough for me and hopefully there would be no complaints from the sound guys. +1 I have a drape over Sennheiser that works good enough for me. My only question/issue would be: I wonder if any of the major amp makers would build them in as an accessory, for those that would pay extra for them when buying a new amp?

In my very limited experience, I have seemed to like placing a mic a little to the side of the dust-cap's edge, almost but not quite at 90° to the plane of the cone itself- so that the mic appears 'angled'...

I stick by the sm57 in front of the dome pointed off angle at the valley between the dome and the cone, listen tweak as necessary. but this could be promising, you never know I may buy one and ab some results.